Lubricating device.



F. GRBINER.

LUBRIOATING DEVICE.

APPLICATION FILED AUG. 15/1913.

Patented July 7, 1914.

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Jq'gcl WILL X mm a THE NORRIS PETERS CO. PHOTOJJINOY. VIASHINGYON, D C

P. GREINBR.

LUBRIUATING DEVICE. APPLIOATION mum AUG.15, 1013.

1,102,268, Patented July '7, 1914.

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THE NORRIS PETERS CO PHOTO-LITHO.. WASH/NON", D- C.

ITE STATlggEAFENT OFFICE.

FRIEDRICH GREINER, OF SCHWABISCH GMUND, GERMANY, ASSIGNOR T0 OTTO SCI-ILICK, OF BERLIN, GERMANY.

LUBRICATING DEVICE.

Specification of Letters Patent.

Patented July '7, 1914.

Application filed August 15, 1913. Serial No. 784,950.

To (all whom it may concern Be it known that I, Fumnniorr Gunmen, ot' Schwiibisch Gmiind, a subject of the King of WVurttemberg, and whose postoflice address is 8 Bergstrasse, Schwiibisch (lmiind, near Stuttgart, Kingdom of lVurttemberg, German Empire, have invented a new and useful Lubricating Device, of which the following is a specification.

This invention relates to a lubricating device provided with a gear forcing pump and adapted for use more particularly in automobiles and other vehicles and engines where such central oiling devices are used. In such cases it is desirable that the device should fulfil two conditions in the working. First, it is necessary that the driving of the pump sliould be as simple as possible and that at the same time reciprocating parts such as pistons, valves, and the like are obviated, and the second condition is that the pump should not deliver a continuous stream of oil, but that this stream should be caused to pulsate in the narrow passages. The necessity for the latter requirement resides in the well known fact that the flow of liquid in narrow passages is less subject to stoppage when it is pulsating. It will be readily understood that if the flow is continuous in one direction any particle of impurity which may be caught by a roughness of any kind on the interior of a tube will tend to remain where deposited and eventually, by stopping other particles, cause partial or complete stoppage. It, on the other hand, the How of liquid is pulsating, that is with a periodic back How (it the liquid, particles deposited on, the interior of the passage during a period ol forward flow will be lifted if the current is caused to momentarily flow backward. WVhcn the direction of the current is again reversed the particle will be carried past the obstruction and similarly past any other obstructions on the interior of the passage. To comply with both these conditions simultaneously is extremely ditlicult. Now according to the present invention this object is attained by the oil pump being constructed in a known manner as a toothed gear forcing pump in which, however, according to the present invention the toothed rims of both wheels are cut out or mutilated for a corresponding distance so that every time the wheels hear one on the other at their mutilated portions the oil may find time to pass from the pressure chamber of the pump into the suction chamber whereby the desired pulsation of the oil current in the feed passages is produced 1n spite of the simple driving and upon avoiding pistons, valves and the like. Moreover, this construction of the oil pum offers the advantage oi? affording a sa'egnard against too high a pressure in the conduits and against the bursting thereof, since when the pump for some cause or other attains too high a speed whereby the pressure in the pressure conduit is increased, the pres sure difference between the suction chamber and the pressure chamber is varied accordingly and the return flow of the oil from the one chamber to the other takes place to a corresponding degree through the cut-away or mutilated gear rims.

The drawing illustrates an improved lubricating device according to this invention, in Figure 1 in a transverse section of the pump, in Fig. 2 in a longitudinal section, and in Fig. 3 in a lateral section.

As shown, the bottom of an oil tank a is provided with a casing Z) of a toothed gear forcing pump which comprises in known .manner two oppositely rotating toothed wheels 1: and (Z. Of these, one wheel is driven, for instance, by a worm gear 6 f, so that only the driving shaft (1 projects outwardly. Arranged to communicate with the suction chan'iber 71, of the pump, in the cover of the pump casing, as indicated in dotted lines in Fig. 2, is an opening 2' so that the oil is free to enter the pump easing directly without any intermmliate conduit. Leadiugirom the pressure chamber l: of the pump to the imlividual branch conduits m are pressure conduits Z. In the branch conduits m are arranged in a known manner the oil. level indicators n and leading "from the latter, as shown in Fig. 2, are the individual passages 0 arranged in the cover of the casing and terminating in the connecting socket p. A needle valve (1 enables the eross-section to be regulated and a covering screw 9 is provided to guard against unauthorized manipulation.

As shown in Figs. 1 and 2, recesses .s' and t are produced in the toothed rims of the wheels 0 and (Z by cutting away the teeth to an equal distance on both wheels so that when these recesses face one another, as

shown in Fig. 1, during each rotation of the wheels, a direct communication is established between the suction chamber it and the pressure chamber is of the pump Whereby in each revolution a return flow takes place and a pulsation is brought about in the pressure conduits.

What I do claim as my invention, and desire to secure by Letters Patent of the United States, is

1. In a gear forcing pump for lubricating systems, the combination with a casing provided with suction and pressure chambers, of gears in the casing, said gears having means operative during a predetermined in terval occurring in each revolution of the gears to periodically establish communication bet-ween the pressure chamber and the suction chamber.

2. In a gear forcing pump for lubricating systems, the combination with a casing provided with suction and pressure chambers, of gears in the casing, said gears having means operating synchronously with the gears during a portion of the rotation thereof to establish communication between the pressure chamber and the suction cham ber.

8. In a gear forcing pump for lubricating systems, the combination with a casing provided with suction and pressure chambers,

sure chambers periodically, as the gears rotate.

In a lubricating device, the combination with an oil tank, of a gear forcing pump having its casing integral with the bottom of the said oil tank, oil passages arranged in the said bottom and connected with the pressure chamber of the said pump, a port .in the said. pump casing to connect the oil tanl: with the suction chamber of the said pump and means for periodically establishing connnunication between the pressure chamber and the suction chamber.

in testimony whereof I have hereunto set my hand in presence oi two subscribing witnesses.

FRIEDRICH GREINER.

Witnesses FRIDA KLAmnn, Ennns'r ENTENMAYN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

